Stopping device for looms or the like



March 19, 1935.

v E. (3. SMITH ET AL 1,994,595-

STOPPING DEVICE FOR LOOMS OR THE LIKE Filed June 15, 1952 3 Sheets-Sheetl March 19, 1935. E. c. SMITH ET AL I 1,994,595

STOPPING DEVICE FOR LOOMS OR THE L I KE w Filed June 15, 1952 sSheets-Sheet 2 v .77 a v if March E. C.SMITH El AL 1,994,595

STOPPING DEVICE FOR LOOMS OR THE LIKE Filfi June 15, .1952 5Sheets-Sheet 3 jz z niargz- Patented Mar. 19, 1935 UNITED STATS] orries"STOPPING'DEVICE FOR LOOMS R THE LIKE Edwin C. Smith, Providence, andWalter J. McLaughlin, lPawtucket, R1,, assignors, to

Rhode Island Warp StopEquipmentCompany, 1 Portland, Maine,-a corporationof Maine Application June 15, 1932, Serial No. 617,308.

20 Claims. (01. 192-125) V Our invention is an improved electricalstopdevice for looms and other machines. The purpose of the device is toprovide a cam-operated knocleofi with no continuously moving parts asidefrom the calm, as well as to providefor certainty of of our device withfor; and 1 Figs. 3, 4, 5 andffi illustrate successive stages ofoperation of the device.

. Referring to Figshl and 2, the bottom shaft 20f a loom carriesa cam 3.Adjacent said cam is a casing 4 carried on a bracket& which in turn issecured to the loom-side 6. Mounted in the casing is a stud 7 upon whichthe hub 9 of a cam-follower 8 is pivoted.

The cam-follower 8'is normally withheld from engaging the cam 3, by adetent-member l0 hav-' ing a hook 11 which engages withthe top tip 12 ofa cross-arm 13 on the cam follower 8. S115- pended from the detent 'bymeans of a connecting link 14 is a pawl 15 having an upwardly extendinghook 16 which is normally positioned just below the bottom tip 1'7formed at the opposite end of the cross-arm 13. a

The pawl 15'is mounted on an arm 18 of the rock shaft 19, the armcarrying at its lower extremity a pin 20 which projects through atransverse slot 21 in the pawl. The arm 22 of the pawl 15, between itsslotted end and the pin 23, by which it is connected with the detent 10through the connecting link 14:, is relativelyheavy as compared with thehooked portion 24 on the opposite side of the suspension pin 23. Theeffect of this distribution of mass is to hold the hook 16 upward sothat if lifted, it engages the tip 17 when the latter moves in aclockwise direction as Viewed in the drawings. The hook l6 may alsoyield'to the pressure of the tip 17 when the latter moves in theopposite direction but returns under the counterbalance actionto, engagesaid tip at the proper time.

The surface 51of the tip 17- is inclinedwith respect to the coastingsurface 52 of the hook 16 to provide that when the follower 8 descendsthe secured to the casing 4.

cross-arm 13 moves in a contra-clockwisedirection "and the surface 51acts cam-fashion on the surface 52 to depress the pawl '15' andpermitengagement of the tip 1''! andhook 16.

The detent 10 is mounted on a pin25 at the top 5 of a lever 26. Thelever is substantially U-shaped in outline to adapt it to pass by therock shaft 19 and its bearing and position the M1025 over the rock shaft19 and the pin 20. The lever 26 is positioned behindthe arm 18 andswings on a pivot- .10 pin 27 also located at the rear of the arm 18 andt On the arm 18 isa pro ectionpr pin 28 which engages a slot 29 in thedetent-lever' 26.

Through this connectionrotative movement of 15 the arml8 causesconcurrent movement ofthe detent-lever 26 and the detentlO connectedthereto. A greater extent of movement is effected than would ensue werethe detent-lever 26 an extension of the arm 18. On the rock shaft 19'and pref- 120 erably located at the rear of the casing l'is a knock-offlever 30 which, through the means of a knock-off rod 31, acts upon thestopping mechanism of the loom, see Fig. 2. The stopping mechanismusually comprises a starting-handle 32, a 25 roller rod 33, a loop, socalled, 34 and alock orclutch-leVer 35. A support or bearing 36 attached.to the loom at a convenient point supports the knock-ofi rod 31adjacent the loop'34. ,Onthe knock-01f rod 31 is a dog 38 which nor- .30

.mally abuts the side of the loop 34 when the loom is in operation.Pressure of the .dog 38 against the loop 34 moves the latter-and, causesrelease of the stopping apparatus and arrestment of the loom. Pressureof the dog 38 thereagainst .35

is effected by the cam.3 in raising the follower 8 with the pawl 15engaged with the tip 17 of the follower cross-arm 13, the tip 17 movingin the direction of the arrow a. A sufficient extent of movement of thedog 38 under the action of the cam 3 is less than the movement of theloop 34 after the release of the stopping apparatus. Consequently, aftersuch stopping effect has been secured the loop 34 recedes from thedog38,re-

lieving the pressure between the tip 17 and the A5 hook 16 andpermitting the pawl 15 to fall away freely from engagement with saidtip,

Engagement of the hook 16 of the pawl 15 with the tip 17 is effected bymeans of .amagnet 39 secured to the top of the casing 4. Themagnet '50as herein shown is of the solenoid type having a plunger 40 to whichisattached the pawl 15 by means of a suspensionelink 41. The lower end ofthe link ll is preferably fittedto the same pin ,23 that pivotallyasecuresthe connecting-link 14 vof contact with the insulated --currenceof faulty performance. by the loom reextending between the pawl 15 andthe detent 10. The detent 10 acts to control the movement of both thefollower 8 and the pawl 15. When in the position shown in Figs. 1, 2 and3, the detent 10 withholds the follower from engaging the cam and alsoholds the pawl in readiness to engage the bottom tip 17. When the detentl0 is-raised and the follower has been released with the curved edge 42of the detent resting on the tip 12, the tip 12 of the follower catch torestrain the pawl 15 from disengagement with the bottom tip 17 of thefollower even though the circuit may have been opened or broken and themagnet rendered inactive and inoperative to hold the pawl 15 to itsoperative engagement with the tip 17. v

The electrical circuit of which the magnet winding is a part isdiagrammatically represented in Fig. 2. The source of electrical energyis here indicated conventionally as a transformer 43 with secondary orstop-motion winding 44.

One'side 45 of the circuit is grounded at a convenient ,point'46 in theloom while the other side 47 extends through a switch 48 and thence tothe -magnet 39. From the magnet it extends to the controlling pointwhich is here shown as the insulator member 49 of a drop-wirecontact-bar.

- This contact-bar is secured to the loom side 6 by metallic brackets,notherein shown, andthe body 50 of the contact-bar is also securedthereto and .consequently grounded. The drop-wire 51 which constitutesthe agent for closing the circuit when the loom is running is normallysuspended out leases the drop-wire 51 causing it to close the circuitbetween the body 50 and insulated member :49 of thecontact-bar. Thiscauses our stoppingdevice to function to arrest the operation of theloom.

Stopping of the loom automatically opensthe electrical circuit at theswitch 48 through the means of a clutch-lever 35 acting upon the lever55 of. the switch .48. As shown in Fig. 2, the clutch-lever 35 acts uponthe switch-lever 55 to close the circuit. Whenthe loom stops, the end ofthe'clutch-lever 35 recedes fromthefswitchlever 55-permitting the switchto open the circuit. The construction of the parts of the loom abovedescribed are well known to those versed in the art and therefore needno further description herein.

Figs. 3, 4, 5 and 6 depict the successivestages in the cycle ofoperations. Fig. 3 shows the parts in normal position with the loomoperating withoutfaults or circumstance of action calling for arrestingthe operation of the loom through the means of our device. As beforeexplained the follower 8 is withheld from the cam 3 by the hook '11 ofthe detent 10. 1

Referring to Fig. 4, one of the drop-wires 51 has been released by theyarn drawing therethrough and through means above described the pawl 15is raised. In rising, the hooked end of the pawl encounters the bottomtip 1'7 of the follower cross-arm 13 so that the counterweighted arm 22is raised with the pin 20 riding in the slot 21. The raising of the pawl15 causes concurrent raising of the detent 10 through the means of theconnecting link 14. As the-detent 10 is raisedthe follower 8 is releasedso thatit falls upon the cam 3, the top tip 12 of the follower cross-arm13 following the curved under edge or surface 42 of the detent. Shouldthe' electric circuit open even momentarily, the'engagement acts as adetent or member 49. Oc-

of the top tip 12 of the follower cross-arm with the curved edge 42 ofthe detent 10 will hold the 16 into position to be engaged by the tip 17when 1 said tip is'moved by the cam 3 in'the direction as. indicated bythe arrow at. As illustrated in Fig. 6 the cam 3 during its rotationraises the end of the follower 8 and the tip 17 acts to pull the'pawl 15and rock the lever 18. The shaft 19 is thus given a slight rotativemovement to cause stopping of theloom' through movement of the knock-offlever .30 and knock-01f rod 31 in the manner as before described. Suchmovement of the rock-shaft 19 with itsarm 18 effects longitudinalmovement of the detent '10 in the'direction of the arrow 2) and causesthe hook 11 of the detent 10 to override the tip 12 and drop thereover.When the loom is again started by operating the loom handle 32 the loop34' is pushed against the dog '38 to cause movement of the knock-off rod31 and lever'30in the direction of the arrow d. This motion imparts to.the detent lever 26 movement in the opposite direction.

The hook 11 of thedetent 10 being engaged-with the tip 12 of thefollower 8 raisesthe latter from the path of the cam and the parts arerestored,

to the normal position depicted in Fig. 3.

Obviously our invention as described is susceptible of constructionalvariation and embodi-.

ment in mechanical equivalent of what-we'have shown and described.Therefore, without limiting ourselves tothe precise structure rangementset forth, we claim:

1. In an electrical stop-device, the combination with the stoppingapparatus of a machine, and an operative shaft of said machine, of a camon said shaft, a follower operative from said cam, means connecting thefollower with the stopping apparatus aforesaid, a detentto withhold thefollower from the cam to render the cam.in-' capable of acting on saidstopping apparatus, and means to release said followerto secure actionof the cam on said stopping apparatus. j

2. In an electrical stop-device, the combination with the stoppingapparatus of a machine, an operative shaft of said machine, and a cam onsaid shaft, of a follower operative from said earn, a detent to restrainthefollower from such operation, asuspension link on saiddetent, amember suspended by said link out of reach of the follower, meansintermediate said suspended member and the stopping apparatus by whichthe cam can act upon said stopping apparatus, a

magnet to concurrently release the detent from the follower and bringthe suspended member" within reach of the follower, and means to connectthemagnet and the suspended member..-

3. In an electrical stop-device, the. combination with a cam, and meansto'operate the cam, .of a follower, a detent to withhold the followerfrom the cam, which detent has a surface which rides upon thefollower tohold the detent in 1 and arraised position while the cam operates on thegage the follower, a connection between the magnet and the hook, and adetent connected with the hook under which a part of thefollower passesto hold up the detent and retain the hook in position to engage saidfollower.

5. In an electrical stop-device, the combination with a cam follower, acam, means for operating the cam, and a member to be moved by the cam,said member having a projection, of a pawl having a hook at one end anda transverse slot at the opposite end engaging the projection on themember to be moved, the slotted portion being heavier than the hookedportion, a magnet to raise the pawl to encounter the follower and to bemoved thereby, and a suspension link extending from the magnet to thepawl and connecting with said pawl at a point such that the heavyslotted end counterbalances and holds up the hooked end.

6. The combination of a cam, a follower for the cam, and a detent toengage the follower, said detent formed with one surface to restrain thefollower from movement and another surface by which to be restrainedfrom movement by the follower.

7. The combination of acam, a follower operative from the cam, and apawlfor engaging the follower, said pawl formed with a hook at one end,a transverse slot at the opposite end and a point of suspension betweenthe hook and the slot such that the slotted end tends to overbalance thehook end and hold it in raised position.

8. The combination of a cam, a follower operative from the cam, saidfollower formed with a hub and a follower portion extending from saidhub and with a cross-arm at the hub having two tips, a detentcooperating with one tip of the follower to restrain the latter fromaction and a pawl cooperating with the other tip of the follower totransmit action.

9. In an electrical stop-device, the combination with a cam follower, acam, and means to operate the cam, of a member to be moved by the camthrough the follower, a pawl carried by said member and engageable withsaid follower, a lever adjacent the member to bemoved, connectionsbetween the member and lever, a detent mounted at the top of said leverto control the follower, and means to lift both detent and pawl.

10. In an electrical stop-device, the combination with a cam follower, acam,.and means to operate the cam, of a detent to withhold the followerfrom the cam, said detent mounted adjacent the follower, and means tomove said detent longitudinally to vary its position in respect to thefollower.

11. In an electrical stop-device, the combination with a cam follower, acam, meansto opcrate the cam, and a detent having a formation torestrain the follower from engaging said cam, of a lever on which saiddetent is mounted, and means to vibrate said lever to impartlongitudinal movement to said detent to vary the position of its detentformation relative to the position of the follower. I

12. In an electrical stop-device, the combination with a stop-member tobe moved, a cam, its follower, and connections between said follower andstop-member, of a lever, means to oscillate the lever from saidstop-member, and a detent carried by the lever to engage the followerand withhold it from engaging the cam.

13. The combination with a cam, and a follower operated thereby, ofmeans having a detent formation to engage and restrain the follower fromfollowing the cam, said means having a surface'to ride on the followerwhen the latter is following the cam whereby to'prevent the detent fromreturning to its restraining position, and means to move the detent torelease the follower.

14. A cam follower forcam-operated devices,

, said follower having a hub with a portion extending in one directionfrom said hub and a crossarm at said hub extending from either side ofsaid first portion, which cross arm has hooked extremities.

15. In a cam-operated device, a cam, a cam follower formed with a hubwith an arm extending substantially radially from said hub and across-arm adjacent the hub extending transversely of the first arm, oneextremity of said cross-arm formed to prevent the cam-following arm fromfollowingthe cam, and the other extremity of the cross-arm formed. totransmit movement of the cam follower under action of said cam.

16. As a new article of manufacture, a transmission member formed with ahooked extremity, a transverse slot at its oppositeextremity, which slotreceives the mounting on which thetransmission member is swung intooperative position, and. with a suspension formation intermediate theextremities by which the transmission member is swung upon the axis ofaforesaid mounting into operative position and on the axis of whichsuspension formation the transmission member swings to yield its hookedextremity to operative action.

17. In a stop-device, the combination of a moving element, atransmission member formed with a hooked extremity at one end forengaging the moving element, and means for suspending the transmissionmember to permit rise and fall of its hooked extremity, the opposite endof the transmission member being transversely slotted andcounterweighted to hold the hooked extremity in a given position.

18. In a stop-device, the combination of a cam, a cam-follower having across-arm projecting therefrom through which action of the cam istransmitted and means engageable with the cross-arm of the cam-followerto withdraw and withhold the follower from the action of the cam.

19. In a stop-device, the combination of a moving element, astop-element movable therefrom, and a pawl for transmitting motion fromsaid moving element to the movable element, said pawl having two axes ofoscillation to adapt it to swing about one axis to carry it intooperative position and about the other axis to effect operativeengagement with the movable element after having been swung on thefirst-named axis.

20. In a stop-device, the combination of a moving element, atransmission member, a movable member to which motion is transmittedfrom the first element by the transmission member, said transmissionmember formed at one extremity with means to encounter and engage saidmoving element and having a formation at the.

opposite extremity by which it is maintained in engagement with themovable member with freedom of transverse movement thereon, and meansfor suspending said transmission member at a point intermediate saidextremities to adapt it to swing, about its point of suspension toeffect engagement with said moving element.

EDWIN C. SMITH.

WALTER J. MoLAUGHLIN.

